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<h1 class="title">gameoflifemodel.cpp 示例文件</h1>
<span class="subtitle">tableview/gameoflife/gameoflifemodel.cpp</span>
<!-- $$$tableview/gameoflife/gameoflifemodel.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">

  <span class="comment">/****************************************************************************
  **
  ** Copyright (C) 2018 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the examples of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
  ** Commercial License Usage
  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
  ** Software or, alternatively, in accordance with the terms contained in
  ** a written agreement between you and The Qt Company. For licensing terms
  ** and conditions see https://www.qt.io/terms-conditions. For further
  ** information use the contact form at https://www.qt.io/contact-us.
  **
  ** BSD License Usage
  ** Alternatively, you may use this file under the terms of the BSD license
  ** as follows:
  **
  ** &quot;Redistribution and use in source and binary forms, with or without
  ** modification, are permitted provided that the following conditions are
  ** met:
  **   * Redistributions of source code must retain the above copyright
  **     notice, this list of conditions and the following disclaimer.
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  ** $QT_END_LICENSE$
  **
  ****************************************************************************/</span>

  <span class="preprocessor">#include &quot;gameoflifemodel.h&quot;</span>
  <span class="preprocessor">#include &lt;QFile&gt;</span>
  <span class="preprocessor">#include &lt;QTextStream&gt;</span>
  <span class="preprocessor">#include &lt;QRect&gt;</span>

  GameOfLifeModel<span class="operator">::</span>GameOfLifeModel(<span class="type"><a href="../qtcore/qobject.html">QObject</a></span> <span class="operator">*</span>parent)
      : <span class="type"><a href="../qtcore/qabstracttablemodel.html">QAbstractTableModel</a></span>(parent)
  {
      clear();
  }

  <span class="type">int</span> GameOfLifeModel<span class="operator">::</span>rowCount(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> <span class="operator">&amp;</span>parent) <span class="keyword">const</span>
  {
      <span class="keyword">if</span> (parent<span class="operator">.</span>isValid())
          <span class="keyword">return</span> <span class="number">0</span>;

      <span class="keyword">return</span> height;
  }

  <span class="type">int</span> GameOfLifeModel<span class="operator">::</span>columnCount(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> <span class="operator">&amp;</span>parent) <span class="keyword">const</span>
  {
      <span class="keyword">if</span> (parent<span class="operator">.</span>isValid())
          <span class="keyword">return</span> <span class="number">0</span>;

      <span class="keyword">return</span> width;
  }

  <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span> GameOfLifeModel<span class="operator">::</span>data(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> <span class="operator">&amp;</span>index<span class="operator">,</span> <span class="type">int</span> role) <span class="keyword">const</span>
  {
      <span class="keyword">if</span> (<span class="operator">!</span>index<span class="operator">.</span>isValid() <span class="operator">|</span><span class="operator">|</span> role <span class="operator">!</span><span class="operator">=</span> CellRole)
          <span class="keyword">return</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span>();

      <span class="keyword">return</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span>(m_currentState<span class="operator">[</span>cellIndex({index<span class="operator">.</span>column()<span class="operator">,</span> index<span class="operator">.</span>row()})<span class="operator">]</span>);
  }

  bool GameOfLifeModel<span class="operator">::</span>setData(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> <span class="operator">&amp;</span>index<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span> <span class="operator">&amp;</span>value<span class="operator">,</span> <span class="type">int</span> role)
  {
      <span class="keyword">if</span> (role <span class="operator">!</span><span class="operator">=</span> CellRole <span class="operator">|</span><span class="operator">|</span> data(index<span class="operator">,</span> role) <span class="operator">=</span><span class="operator">=</span> value)
          <span class="keyword">return</span> <span class="keyword">false</span>;

      m_currentState<span class="operator">[</span>cellIndex({index<span class="operator">.</span>column()<span class="operator">,</span> index<span class="operator">.</span>row()})<span class="operator">]</span> <span class="operator">=</span> value<span class="operator">.</span>toBool();
      <span class="keyword">emit</span> dataChanged(index<span class="operator">,</span> index<span class="operator">,</span> {role});

      <span class="keyword">return</span> <span class="keyword">true</span>;
  }

  <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>ItemFlags GameOfLifeModel<span class="operator">::</span>flags(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span> <span class="operator">&amp;</span>index) <span class="keyword">const</span>
  {
      <span class="keyword">if</span> (<span class="operator">!</span>index<span class="operator">.</span>isValid())
          <span class="keyword">return</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>NoItemFlags;

      <span class="keyword">return</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>ItemIsEditable;
  }

  <span class="type">void</span> GameOfLifeModel<span class="operator">::</span>nextStep()
  {
      StateContainer newValues;

      <span class="keyword">for</span> (std<span class="operator">::</span>size_t i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator">&lt;</span> size; <span class="operator">+</span><span class="operator">+</span>i) {
          bool currentState <span class="operator">=</span> m_currentState<span class="operator">[</span>i<span class="operator">]</span>;

          <span class="type">int</span> cellNeighborsCount <span class="operator">=</span> <span class="keyword">this</span><span class="operator">-</span><span class="operator">&gt;</span>cellNeighborsCount(cellCoordinatesFromIndex(<span class="keyword">static_cast</span><span class="operator">&lt;</span><span class="type">int</span><span class="operator">&gt;</span>(i)));

          newValues<span class="operator">[</span>i<span class="operator">]</span> <span class="operator">=</span> currentState <span class="operator">=</span><span class="operator">=</span> <span class="keyword">true</span>
                  <span class="operator">?</span> cellNeighborsCount <span class="operator">=</span><span class="operator">=</span> <span class="number">2</span> <span class="operator">|</span><span class="operator">|</span> cellNeighborsCount <span class="operator">=</span><span class="operator">=</span> <span class="number">3</span>
                  : cellNeighborsCount <span class="operator">=</span><span class="operator">=</span> <span class="number">3</span>;
      }

      m_currentState <span class="operator">=</span> std<span class="operator">::</span>move(newValues);

      <span class="keyword">emit</span> dataChanged(index(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>)<span class="operator">,</span> index(height <span class="operator">-</span> <span class="number">1</span><span class="operator">,</span> width <span class="operator">-</span> <span class="number">1</span>)<span class="operator">,</span> {CellRole});
  }

  bool GameOfLifeModel<span class="operator">::</span>loadFile(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&amp;</span>fileName)
  {
      <span class="type"><a href="../qtcore/qfile.html">QFile</a></span> file(fileName);
      <span class="keyword">if</span> (<span class="operator">!</span>file<span class="operator">.</span>open(<span class="type"><a href="../qtcore/qiodevice.html">QIODevice</a></span><span class="operator">::</span>ReadOnly))
          <span class="keyword">return</span> <span class="keyword">false</span>;

      <span class="type"><a href="../qtcore/qtextstream.html">QTextStream</a></span> in(<span class="operator">&amp;</span>file);
      loadPattern(in<span class="operator">.</span>readAll());

      <span class="keyword">return</span> <span class="keyword">true</span>;
  }

  <span class="type">void</span> GameOfLifeModel<span class="operator">::</span>loadPattern(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&amp;</span>plainText)
  {
      clear();

      <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> rows <span class="operator">=</span> plainText<span class="operator">.</span>split(<span class="string">&quot;\n&quot;</span>);
      <span class="type"><a href="../qtcore/qsize.html">QSize</a></span> patternSize(<span class="number">0</span><span class="operator">,</span> rows<span class="operator">.</span>count());
      <span class="keyword">for</span> (<span class="type"><a href="../qtcore/qstring.html">QString</a></span> row : rows) {
          <span class="keyword">if</span> (row<span class="operator">.</span>size() <span class="operator">&gt;</span> patternSize<span class="operator">.</span>width())
              patternSize<span class="operator">.</span>setWidth(row<span class="operator">.</span>size());
      }

      <span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span> patternLocation((width <span class="operator">-</span> patternSize<span class="operator">.</span>width()) <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> (height <span class="operator">-</span> patternSize<span class="operator">.</span>height()) <span class="operator">/</span> <span class="number">2</span>);

      <span class="keyword">for</span> (<span class="type">int</span> y <span class="operator">=</span> <span class="number">0</span>; y <span class="operator">&lt;</span> patternSize<span class="operator">.</span>height(); <span class="operator">+</span><span class="operator">+</span>y) {
          <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> line <span class="operator">=</span> rows<span class="operator">[</span>y<span class="operator">]</span>;

          <span class="keyword">for</span> (<span class="type">int</span> x <span class="operator">=</span> <span class="number">0</span>; x <span class="operator">&lt;</span> line<span class="operator">.</span>length(); <span class="operator">+</span><span class="operator">+</span>x) {
              <span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span> cellPosition(x <span class="operator">+</span> patternLocation<span class="operator">.</span>x()<span class="operator">,</span> y <span class="operator">+</span> patternLocation<span class="operator">.</span>y());
              m_currentState<span class="operator">[</span>cellIndex(cellPosition)<span class="operator">]</span> <span class="operator">=</span> line<span class="operator">[</span>x<span class="operator">]</span> <span class="operator">=</span><span class="operator">=</span> <span class="char">'O'</span>;
          }
      }

      <span class="keyword">emit</span> dataChanged(index(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>)<span class="operator">,</span> index(height <span class="operator">-</span> <span class="number">1</span><span class="operator">,</span> width <span class="operator">-</span> <span class="number">1</span>)<span class="operator">,</span> {CellRole});
  }

  <span class="type">void</span> GameOfLifeModel<span class="operator">::</span>clear()
  {
      m_currentState<span class="operator">.</span>fill(<span class="keyword">false</span>);
      <span class="keyword">emit</span> dataChanged(index(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>)<span class="operator">,</span> index(height <span class="operator">-</span> <span class="number">1</span><span class="operator">,</span> width <span class="operator">-</span> <span class="number">1</span>)<span class="operator">,</span> {CellRole});
  }

  <span class="type">int</span> GameOfLifeModel<span class="operator">::</span>cellNeighborsCount(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span> <span class="operator">&amp;</span>cellCoordinates) <span class="keyword">const</span>
  {
      <span class="type">int</span> count <span class="operator">=</span> <span class="number">0</span>;

      <span class="keyword">for</span> (<span class="type">int</span> x <span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>; x <span class="operator">&lt;</span><span class="operator">=</span> <span class="number">1</span>; <span class="operator">+</span><span class="operator">+</span>x) {
          <span class="keyword">for</span> (<span class="type">int</span> y <span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>; y <span class="operator">&lt;</span><span class="operator">=</span> <span class="number">1</span>; <span class="operator">+</span><span class="operator">+</span>y) {
              <span class="keyword">if</span> (x <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span> <span class="operator">&amp;</span><span class="operator">&amp;</span> y <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>)
                  <span class="keyword">continue</span>;

              <span class="keyword">const</span> <span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span> neighborPosition { cellCoordinates<span class="operator">.</span>x() <span class="operator">+</span> x<span class="operator">,</span> cellCoordinates<span class="operator">.</span>y() <span class="operator">+</span> y };
              <span class="keyword">if</span> (<span class="operator">!</span>areCellCoordinatesValid(neighborPosition))
                  <span class="keyword">continue</span>;

              <span class="keyword">if</span> (m_currentState<span class="operator">[</span>cellIndex(neighborPosition)<span class="operator">]</span>)
                  <span class="operator">+</span><span class="operator">+</span>count;

              <span class="keyword">if</span> (count <span class="operator">&gt;</span> <span class="number">3</span>)
                  <span class="keyword">return</span> count;
          }
      }

      <span class="keyword">return</span> count;
  }

  bool GameOfLifeModel<span class="operator">::</span>areCellCoordinatesValid(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span> <span class="operator">&amp;</span>coordinates)
  {
      <span class="keyword">return</span> <span class="type"><a href="../qtcore/qrect.html">QRect</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> width<span class="operator">,</span> height)<span class="operator">.</span>contains(coordinates);
  }

  <span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span> GameOfLifeModel<span class="operator">::</span>cellCoordinatesFromIndex(<span class="type">int</span> cellIndex)
  {
      <span class="keyword">return</span> {cellIndex <span class="operator">%</span> width<span class="operator">,</span> cellIndex <span class="operator">/</span> width};
  }

  std<span class="operator">::</span>size_t GameOfLifeModel<span class="operator">::</span>cellIndex(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span> <span class="operator">&amp;</span>coordinates)
  {
      <span class="keyword">return</span> std<span class="operator">::</span>size_t(coordinates<span class="operator">.</span>y() <span class="operator">*</span> width <span class="operator">+</span> coordinates<span class="operator">.</span>x());
  }

</pre>
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<!-- @@@tableview/gameoflife/gameoflifemodel.cpp -->
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